Printing machine



y J. J. LEARY PRINTING MACHINE Filed 561512. 19, 1923 INVENTOR. .1552: f Zea 7y ATTORNEYS,

Patented May 3, 1927.

UNITED STATES JOHN J, LEARY, OF BROOKLYN, NEW YORK.

PRINTING MACHINE.

Application filed September This invention relates to printing machines of the type known as web and flat bed perfecting presses. In these types of presses wherein the paper is printed successively upon the opposite sides, it is necessary to pass the ink-wet side of the Web or paper in contact with a packing cylinder, with the result that the packing cylinder receives a quantity of ink and other matter, together known as offset deposit, from the paper. If the deposit were not removed from the packing cylinder it would collect or accumulate and smut or smudge the, web of paper, and attempts heretofore made to remove-this deposit have not brought entirely satisfactory results.

An object of this invention is to provlde improved means for removing the offset deposit from the second packing cyllnder in a simple and effective manner; and which Wlll be simple, relatively inexpensive and capable of application to existing types of presses without material modifications or changes therein. Other objects and advantages will be apparent from the following description of an embodiment of the 1nvention and the novel features will be particularly pointed out hereinafterin claims.

In the accompanying drawing:

Fig. 1 is a diagram illustrating the application of the invention to a printing press of the web perfecting type; a

Fig. 2 is an elevation of the cleaner cylinder which forms an essential part of the invention; and

Fig. 3 is another elevationof the cleaner cylinder with the doctor blade in operative relation thereto.

In the illustrated embodiment of the invention and referring to Figure 1, the web or paper which is to be printed is conducted from the supply roll 1 over suitable gu1ding rolls 2, and then between the first plate cylinder 4 and the first packing cylinder 5 where it is printed upon one side. The web or paper is then conducted over suitable guiding rolls Sand between a second plate cylinder 7 and a second packing cylinder 8, where it is printed upon the opposite side, the ink-wet side of the paper or web during the second printing operation running in contact with the surface of the second packing cylinder and leaving thereon what is known as an offset deposit. The web or paper is then conducted over suitable rollers to the ends of the cleaning cylinder.

19, 1923. Serial No. 663,541.

9 to a cutting or folding machine, not

cylinder 10 is geared for operation either in the same direction as, or in the opposite direction to, the rotation of the packing cylinder 8 at their line of contact. Preferably the direction of rotation of the cleaning cylinder will be opposite to that of the packing cylinder at their line of contact.

The cleaning cylinder 10 is illustrated in detail in Figure 2, and is provided upon its peripheral surface with cleaning strips extending longitudinally thereof, which are spaced apart peripherally of the cylinder so as to leave spaces or grooves 12 between them. The cleaning strips are preferably mounted upon the cylinder, with a progression peripherally as well as longitudinally of the cleaning cylinder, so that the strips and the spaces between them will act somewhat as a spiral conveyor for conveying the deposit removed from the packing cylinder In order to accelerate the passage of the removed deposit from the cleaning cylinder,

the strips may be laid in a spiral manner around the surface of the cleaning cylinder from an intermediate point so that the removed otl'set deposit will be conveyed in both directions towards the ends of the cleaning cylinder.

A doctor blade 13 issuitably mounted at one side of the cleaning cylinder with an edge in scraping relation with the outer surface of the cleaning strips 11 so as to remove therefrom a large proportion of the collected offset deposit. This doctor blade, at its scraping edge, is preferably inclined towardeach end from an intermediate point, with the scraping edge suitably formed so as to allow the doctor blade to engage the cleaning cylinder for its entire length. WVith the doctor blade inclined toward each end,the collected deposit which is removed thereby from the cleaning cylinder will be more readily conducted to the ends, at which the deposit may be collected or discharged into suitable cups or containers. It will be understood that the doctor blade may be inclined only in one direction from end to end and operated very satisfactorily, but operates in a more satisfactory manner by having it inclined toward opposite ends from an intermediate point forthe reason that the removed deposit is more rapidly d scharged when it travels less than a half of the length of the cylinder rather. than nearly the entire length thereof.

In order to prevent the permanent adherence of the ink, contained in the offset deposit, to the cleaning strips 11 of. they cleaning cylinder, I may provide an oil fed roller.

i l. in contact with the cleaning cylinder for oiling. the strips during; their rotation, and prior to their. contact with the second. packing cylinder. The oil feeding roller. ltmay be continuously supplied with oil. by any suitable means. such as by an oil: fountainl5.

The cleaning cylinder may be constructed of any suitable material, and may, for example, be given asurface of wood with strips of suitable cleaning material secured thereon. The cleaning strips. may. be ofvarious suitable materlals such as, for example, plush, carpet, bristles, fabric and. vitrifled rubber. The doctor blade may be ofany suitable material, such .as metal, wood,

or composition,

To facilitate or assist; inv the removal of the offset deposit from the second. packing cylinder, this cylinder is preferably'prolvided with a peripheral cover or top, sheet. 16., formed of or treated with, material which has littleor no aflinity for printers,

ink. For example, a special grade of suit.- able paper ranging from 6 to 15 points thlck may be used as the cover. or'top'sheet of the second packing cylinder, andthis paper is prepared or treated. to repel or be non-absorbent as to. printers ink. The cleaning cylinder, acting against. such a cover or, top, sheet on the second packing.

cylinder, may thus more effectively clean.

the surface of the packing cylinder.

In the operation of the cleaning device, and assuming that the cleaning cylinder is driven in a direction to. carry its surface oppositely to the surface of the second packing. cylinder at theirline ofcontact, the cleaning strips will act very much as brushes in sweeping or iping the offset deposit fIOIIl/Clle packing cylinder, a portion of the removed deposit being promptly removed from, the cleaningcylind-er by the doctor blade, and the remainder being pro:

gressively carried, by the spiral. groovesbe tween the strips endwise of the cleaning cylinder until it is discharged from the. ends thereof. The oil feeding roller serves tooil the strips sufliciently to prevent the permanent adherence thereto. of the printing ink and deposit. With this method of cleaning the second packing cylinder, the use of the,

objectionable smut or offset roll is unnecessary, and. the press may be sat sfactorily operated continuously for. long, periods of time.

It will, be obvious that various changes in the details and arrangements of parts, herein described and illustrated for the purpose of explaining the nature of the invention, may be made by thesev skilled in the art within the principle and scope of the invention asexpressed inv the. appended claims.

1. In; printing machinesv having printing and packing cylinders, a cleaner for the. packing cylinder comprising a-cylinder contacti-ng therewith and rotating in con unction therewith, said cleaning cylinder hay-in on its contacting surface, a plurality .o cleaning strips extending in. a dII'BCt/IDD lengthwise thereof and peripherally spaced,- sa-id strips being helically disposedfromthe center toward each end of? the cleaning cylinder whereby the offset depositwhich is removed from the packing cylinder by the strips will be progressively carried to the ends of the cleaning cylinder and discharged.

2. In. printing machines having second printing and packing cylinders, a cleaner for the second packing cylindercomprising a cylinder-contacting therewith and. rotating in-conjunction therewith, said: cleaning cylinder having; on its contacting surface a pl urality ofcleaning strips extending in. a. direction. lengthwise thereof and peripherally spaced and means for oiling the strips on the cleaning cylinder to. prevent the adherence thereto of the offset deposit. 1

3. In printing machines having second. printing and packing cylinders, a cleaner for the second. packing cylinder comprising a cylinder. contacting therewith and rotating in conjunction: tl'ierewith, said cleaning cylinder having on its contacting. surface a plurality of cleaning strips extending in a. direction lengthwise thereof and peripheral? ly. spaced and. a. doctor bladefor removing the offset deposit from. the outer. surfaceof the strips.

4'. In printing. machines having second printing and packing cylinders, a cleanerv for the second: packing cylinder comprising a cylinder contacting therewith and rotating in. conj unction therewith, said cleaningcylinder having on its contacting surface a p1u rality of cleaning strips extending in a direction lengthwise thereof and peripherally spaced and a. doctor bladefor removing the offset deposit from the outer surface of the strips, the surface. of said blade being inclined endwise to. facilitate the discharge therefrom of the removed offset deposit. 1

5.. In printing machines having second printing and packing cylinders, a cleaner .for thesecond packing cylinder comprising at a different speed of rotation relatively to the packing cylinder, said cleaning cylinder having on its contacting surface a plurality of cleaning strips extending in a direction substantially lengthwise thereof and peripherally spaced, said strips being helically disposed from the centertowa'rd each end of the cleaning cylinder whereby the offset deposit Which is removed from the second packing cylinder by the strips will be 10 progressively carried to the ends of the cleaning cylinder and discharged.

In witness whereof, I hereunto subscribe my signature.

JOHN J. LEARY. 

